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Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Net loss	$ (9,066)	$ (21,690)
Basic net loss per share (usd per share)	$ (1.61)	$ 4.92
Diluted net loss per share (usd per share)	$ (1.61)	$ 4.92
Conversion of convertible notes	$ 5,800	$ 5,800
Goodwill and intangible assets impairment loss	5,200	5,200
Business acquisition, transaction costs	3,300	3,300
Historical Interest Expense
Business Acquisition [Line Items]
Pro forma adjustments to net loss	$ 200	$ 300

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